The fibres have different length (as can be better appreciated where they are
dissociated) have even thickness and look assembled in bundles of different
In particular, at higher magnification, the fibres reveal a longitudinal fibrous structure () and all the above mentioned data lead us to the identification of a striated muscular tissue even if the striation is lacking because of the age of the sample. Indeed, this tissue typically consists of syncytial aggregates formed by the fibres through bifurcation and end-to-end junctions ( ); this is visible in all the districts studied in this wide screening which has lead to the identification of myocardial tissue.
The syncytial aggregation of the fibres is a consistent feature of the tissue with sometimes transversal junctions ( ) also where fibres are more crowded and form a dense body. Moreover, a lobule of adipose tissue was found in the interstice of striated muscle and intersected by fibres scattering around ( ).
A network of vessels can be seen, both of arterial and venous type. In one site, close to the vessels, a nervous structure can be seen, to be ascribed to the vagal nerve (). The latter can also be seen as an isolated structure with a thin fibrous coat (perinervium) ().
Last, endocardial structures can be seen, well detectable due to a "lamina" of fibrous tissue with papillar `hills'. In the deeper areas the myocardial tissue can be seen with a clear syncytial structure ( ).
These data are confirmed also at higher magnification, even if the endothelial coat is missing due to the age of the tissue ( ).
It may be underlined that in no histological section any picture appears which could suggest a previous treatment of the tissue with mummifying substances such as those used in the past for the preservation of tissues.